Intersecting Branes Flip SU(5)
John Ellis, P. Kanti, D.V. Nanopoulos

TL;DR
This paper constructs intersecting brane models within a toroidal orbifold framework to realize flipped SU(5) GUT models with varying generations and matter content, exploring both integer and fractional winding number configurations.
Contribution
It presents novel intersecting brane-world constructions of flipped SU(5) models with specific matter and Higgs representations, including models with three generations and complete GUT sectors.
Findings
Models with 8 or more SU(5) generations using integer winding numbers.
Models with 3 flipped SU(5) generations using fractional winding numbers.
Some models contain candidate Higgs representations for electroweak symmetry breaking.
Abstract
Within a toroidal orbifold framework, we exhibit intersecting brane-world constructions of flipped SU(5) \times U(1) GUT models with various numbers of generations, other chiral matter representations and Higgs representations. We exhibit orientifold constructions with integer winding numbers that yield 8 or more conventional SU(5) generations, and orbifold constructions with fractional winding numbers that yield flipped SU(5) \times U(1) models with just 3 conventional generations. Some of these models have candidates for the 5 and {\bar 5} Higgs representations needed for electroweak symmetry breaking, but not for the 10 and {\bar 10} representations needed for GUT symmetry breaking. We have also derived models with complete GUT and electroweak Higgs sectors, but these have undesirable extra chiral matter.
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